I seen a large silver metallic craft that was very large, about the size of a small airfield that came over the horizon at a high rate of speed and came towards where I was standing. The big thing upon getting closer to the shore split into three rounded triangles, all with three centrifugal ultraviolet round engines in a triangle formation which appeared to be inside the aforementioned rounded triangles of the former one which is now three large crafts. There was a transformer like hum coming from the front rounded triangle ahead of the other two rounded triangles in a right triangle formation a possible flight mode to fool the local airport with illusory and then all three rounded triangles made a ninety degree turn and made a run for the border I assume due to the fact a Navy jet was deployed off a aircraft carried and then their was a brief game of cat and mouse and all at once the three crafts with three centrifugal lights that formed three rounded tria! ngles immerged back into one and pulled away from the navy jet at a very high rate of speed headed South towards Mexico. I have never seen nothing like it. You could always see the purple glow of the three fan looking motors of all to one and then a streak that left the Navy jet at I'd say at least 3800 miles per hour. The Navy jet goes around 1300 miles per hour and this irregular large grey silver metallic spaceship went so fast it was like it disappeared right before my eyes. The moon was out and the city lights from San Diego made a aurora which caused the viewing in the dead of night. Something big is getting ready to happen.